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1 | /* shared.xs |
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2 | * |
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3 | * Copyright (c) 2001-2002, 2006 Larry Wall |
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4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
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8 | * "Hand any two wizards a piece of rope and they would instinctively pull in |
9 | * opposite directions." |
10 | * --Sourcery |
11 | * |
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12 | * Contributed by Artur Bergman <sky AT crucially DOT net> |
13 | * Pulled in the (an)other direction by Nick Ing-Simmons |
14 | * <nick AT ing-simmons DOT net> |
15 | * CPAN version produced by Jerry D. Hedden <jdhedden AT cpan DOT org> |
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16 | */ |
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17 | |
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18 | /* |
19 | * Shared variables are implemented by a scheme similar to tieing. |
20 | * Each thread has a proxy SV with attached magic -- "private SVs" -- |
21 | * which all point to a single SV in a separate shared interpreter |
22 | * (PL_sharedsv_space) -- "shared SVs". |
23 | * |
24 | * The shared SV holds the variable's true values, and its state is |
25 | * copied between the shared and private SVs with the usual |
26 | * mg_get()/mg_set() arrangement. |
27 | * |
28 | * Aggregates (AVs and HVs) are implemented using tie magic, except that |
29 | * the vtable used is one defined in this file rather than the standard one. |
7473853a |
30 | * This means that where a tie function like FETCH is normally invoked by |
29ecdb6f |
31 | * the tie magic's mg_get() function, we completely bypass the calling of a |
32 | * perl-level function, and directly call C-level code to handle it. On |
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33 | * the other hand, calls to functions like PUSH are done directly by code |
34 | * in av.c, etc., which we can't bypass. So the best we can do is to provide |
29ecdb6f |
35 | * XS versions of these functions. We also have to attach a tie object, |
36 | * blessed into the class threads::shared::tie, to keep the method-calling |
37 | * code happy. |
38 | * |
39 | * Access to aggregate elements is done the usual tied way by returning a |
40 | * proxy PVLV element with attached element magic. |
41 | * |
42 | * Pointers to the shared SV are squirrelled away in the mg->mg_ptr field |
43 | * of magic (with mg_len == 0), and in the IV2PTR(SvIV(sv)) field of tied |
44 | * object SVs. These pointers have to be hidden like this because they |
45 | * cross interpreter boundaries, and we don't want sv_clear() and friends |
46 | * following them. |
47 | * |
48 | * The three basic shared types look like the following: |
49 | * |
50 | * ----------------- |
51 | * |
52 | * Shared scalar (my $s : shared): |
53 | * |
54 | * SV = PVMG(0x7ba238) at 0x7387a8 |
55 | * FLAGS = (PADMY,GMG,SMG) |
56 | * MAGIC = 0x824d88 |
57 | * MG_TYPE = PERL_MAGIC_shared_scalar(n) |
7473853a |
58 | * MG_PTR = 0x810358 <<<< pointer to the shared SV |
29ecdb6f |
59 | * |
60 | * ----------------- |
61 | * |
62 | * Shared aggregate (my @a : shared; my %h : shared): |
63 | * |
64 | * SV = PVAV(0x7175d0) at 0x738708 |
65 | * FLAGS = (PADMY,RMG) |
66 | * MAGIC = 0x824e48 |
67 | * MG_TYPE = PERL_MAGIC_tied(P) |
7473853a |
68 | * MG_OBJ = 0x7136e0 <<<< ref to the tied object |
29ecdb6f |
69 | * SV = RV(0x7136f0) at 0x7136e0 |
70 | * RV = 0x738640 |
71 | * SV = PVMG(0x7ba238) at 0x738640 <<<< the tied object |
72 | * FLAGS = (OBJECT,IOK,pIOK) |
7473853a |
73 | * IV = 8455000 <<<< pointer to the shared AV |
29ecdb6f |
74 | * STASH = 0x80abf0 "threads::shared::tie" |
7473853a |
75 | * MG_PTR = 0x810358 "" <<<< another pointer to the shared AV |
29ecdb6f |
76 | * ARRAY = 0x0 |
77 | * |
78 | * ----------------- |
79 | * |
80 | * Aggregate element (my @a : shared; $a[0]) |
81 | * |
82 | * SV = PVLV(0x77f628) at 0x713550 |
83 | * FLAGS = (GMG,SMG,RMG,pIOK) |
84 | * MAGIC = 0x72bd58 |
85 | * MG_TYPE = PERL_MAGIC_shared_scalar(n) |
7473853a |
86 | * MG_PTR = 0x8103c0 "" <<<< pointer to the shared element |
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87 | * MAGIC = 0x72bd18 |
88 | * MG_TYPE = PERL_MAGIC_tiedelem(p) |
7473853a |
89 | * MG_OBJ = 0x7136e0 <<<< ref to the tied object |
29ecdb6f |
90 | * SV = RV(0x7136f0) at 0x7136e0 |
91 | * RV = 0x738660 |
92 | * SV = PVMG(0x7ba278) at 0x738660 <<<< the tied object |
93 | * FLAGS = (OBJECT,IOK,pIOK) |
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94 | * IV = 8455064 <<<< pointer to the shared AV |
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95 | * STASH = 0x80ac30 "threads::shared::tie" |
96 | * TYPE = t |
97 | * |
98 | * Note that PERL_MAGIC_tiedelem(p) magic doesn't have a pointer to a |
99 | * shared SV in mg_ptr; instead this is used to store the hash key, |
100 | * if any, like normal tied elements. Note also that element SVs may have |
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101 | * pointers to both the shared aggregate and the shared element. |
29ecdb6f |
102 | * |
103 | * |
104 | * Userland locks: |
105 | * |
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106 | * If a shared variable is used as a perl-level lock or condition |
29ecdb6f |
107 | * variable, then PERL_MAGIC_ext magic is attached to the associated |
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108 | * *shared* SV, whose mg_ptr field points to a malloc'ed structure |
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109 | * containing the necessary mutexes and condition variables. |
110 | * |
111 | * Nomenclature: |
112 | * |
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113 | * In this file, any variable name prefixed with 's' (e.g., ssv, stmp or sobj) |
114 | * usually represents a shared SV which corresponds to a private SV named |
115 | * without the prefix (e.g., sv, tmp or obj). |
116 | */ |
117 | |
118 | /* Patch status: |
119 | * |
120 | * Perl 5.8.8 contains threads::shared patches up to 26626 (equivalent to |
121 | * blead patches 26350+26351). |
122 | * |
123 | * The CPAN version of threads::shared contains the following blead patches: |
124 | * 26569 (applicable to 5.9.3 only) |
125 | * 26684 |
126 | * 26693 |
127 | * 26695 |
29ecdb6f |
128 | */ |
129 | |
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130 | #define PERL_NO_GET_CONTEXT |
b050c948 |
131 | #include "EXTERN.h" |
132 | #include "perl.h" |
133 | #include "XSUB.h" |
7473853a |
134 | #ifdef HAS_PPPORT_H |
135 | #define NEED_vnewSVpvf |
136 | #define NEED_warner |
137 | # include "ppport.h" |
138 | # include "shared.h" |
139 | #endif |
b050c948 |
140 | |
73e09c8f |
141 | #ifdef USE_ITHREADS |
142 | |
21312124 |
143 | /* |
144 | * The shared things need an intepreter to live in ... |
145 | */ |
146 | PerlInterpreter *PL_sharedsv_space; /* The shared sv space */ |
147 | /* To access shared space we fake aTHX in this scope and thread's context */ |
057e91b3 |
148 | |
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149 | /* Bug #24255: We include ENTER+SAVETMPS/FREETMPS+LEAVE with |
150 | * SHARED_CONTEXT/CALLER_CONTEXT macros, so that any mortals, etc. created |
1011f542 |
151 | * while in the shared interpreter context don't languish */ |
057e91b3 |
152 | |
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153 | #define SHARED_CONTEXT \ |
154 | STMT_START { \ |
155 | PERL_SET_CONTEXT((aTHX = PL_sharedsv_space)); \ |
156 | ENTER; \ |
157 | SAVETMPS; \ |
057e91b3 |
158 | } STMT_END |
21312124 |
159 | |
160 | /* So we need a way to switch back to the caller's context... */ |
161 | /* So we declare _another_ copy of the aTHX variable ... */ |
162 | #define dTHXc PerlInterpreter *caller_perl = aTHX |
057e91b3 |
163 | |
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164 | /* ... and use it to switch back */ |
165 | #define CALLER_CONTEXT \ |
166 | STMT_START { \ |
167 | FREETMPS; \ |
168 | LEAVE; \ |
169 | PERL_SET_CONTEXT((aTHX = caller_perl)); \ |
057e91b3 |
170 | } STMT_END |
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171 | |
172 | /* |
173 | * Only one thread at a time is allowed to mess with shared space. |
174 | */ |
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175 | |
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176 | typedef struct { |
177 | perl_mutex mutex; |
178 | PerlInterpreter *owner; |
179 | I32 locks; |
180 | perl_cond cond; |
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181 | #ifdef DEBUG_LOCKS |
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182 | char * file; |
183 | int line; |
6b85e4fe |
184 | #endif |
6d56dc1c |
185 | } recursive_lock_t; |
186 | |
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187 | recursive_lock_t PL_sharedsv_lock; /* Mutex protecting the shared sv space */ |
6d56dc1c |
188 | |
189 | void |
190 | recursive_lock_init(pTHX_ recursive_lock_t *lock) |
191 | { |
192 | Zero(lock,1,recursive_lock_t); |
193 | MUTEX_INIT(&lock->mutex); |
194 | COND_INIT(&lock->cond); |
195 | } |
196 | |
a39edb3a |
197 | void |
579f9913 |
198 | recursive_lock_destroy(pTHX_ recursive_lock_t *lock) |
199 | { |
200 | MUTEX_DESTROY(&lock->mutex); |
201 | COND_DESTROY(&lock->cond); |
202 | } |
203 | |
6d56dc1c |
204 | void |
205 | recursive_lock_release(pTHX_ recursive_lock_t *lock) |
206 | { |
207 | MUTEX_LOCK(&lock->mutex); |
ba2940ce |
208 | if (lock->owner == aTHX) { |
209 | if (--lock->locks == 0) { |
210 | lock->owner = NULL; |
211 | COND_SIGNAL(&lock->cond); |
212 | } |
6d56dc1c |
213 | } |
214 | MUTEX_UNLOCK(&lock->mutex); |
215 | } |
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216 | |
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217 | void |
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218 | recursive_lock_acquire(pTHX_ recursive_lock_t *lock, char *file, int line) |
6d56dc1c |
219 | { |
220 | assert(aTHX); |
221 | MUTEX_LOCK(&lock->mutex); |
222 | if (lock->owner == aTHX) { |
7473853a |
223 | lock->locks++; |
224 | } else { |
225 | while (lock->owner) { |
6b85e4fe |
226 | #ifdef DEBUG_LOCKS |
7473853a |
227 | Perl_warn(aTHX_ " %p waiting - owned by %p %s:%d\n", |
228 | aTHX, lock->owner, lock->file, lock->line); |
6b85e4fe |
229 | #endif |
7473853a |
230 | COND_WAIT(&lock->cond,&lock->mutex); |
6b85e4fe |
231 | } |
7473853a |
232 | lock->locks = 1; |
233 | lock->owner = aTHX; |
6b85e4fe |
234 | #ifdef DEBUG_LOCKS |
7473853a |
235 | lock->file = file; |
236 | lock->line = line; |
6b85e4fe |
237 | #endif |
6d56dc1c |
238 | } |
239 | MUTEX_UNLOCK(&lock->mutex); |
6b85e4fe |
240 | SAVEDESTRUCTOR_X(recursive_lock_release,lock); |
6d56dc1c |
241 | } |
242 | |
7473853a |
243 | #define ENTER_LOCK \ |
244 | STMT_START { \ |
245 | ENTER; \ |
246 | recursive_lock_acquire(aTHX_ &PL_sharedsv_lock, __FILE__, __LINE__);\ |
247 | } STMT_END |
21312124 |
248 | |
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249 | /* The unlocking is done automatically at scope exit */ |
250 | #define LEAVE_LOCK LEAVE |
6d56dc1c |
251 | |
21312124 |
252 | |
253 | /* A common idiom is to acquire access and switch in ... */ |
7473853a |
254 | #define SHARED_EDIT \ |
255 | STMT_START { \ |
256 | ENTER_LOCK; \ |
257 | SHARED_CONTEXT; \ |
258 | } STMT_END |
21312124 |
259 | |
7473853a |
260 | /* ... then switch out and release access. */ |
261 | #define SHARED_RELEASE \ |
262 | STMT_START { \ |
263 | CALLER_CONTEXT; \ |
264 | LEAVE_LOCK; \ |
265 | } STMT_END |
85e0a142 |
266 | |
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267 | |
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268 | /* User-level locks: |
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269 | This structure is attached (using ext magic) to any shared SV that |
270 | is used by user-level locking or condition code |
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271 | */ |
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272 | |
273 | typedef struct { |
7473853a |
274 | recursive_lock_t lock; /* For user-levl locks */ |
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275 | perl_cond user_cond; /* For user-level conditions */ |
29ecdb6f |
276 | } user_lock; |
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277 | |
7473853a |
278 | /* Magic used for attaching user_lock structs to shared SVs |
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279 | |
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280 | The vtable used has just one entry - when the SV goes away |
281 | we free the memory for the above. |
21312124 |
282 | */ |
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283 | |
21312124 |
284 | int |
29ecdb6f |
285 | sharedsv_userlock_free(pTHX_ SV *sv, MAGIC *mg) |
21312124 |
286 | { |
29ecdb6f |
287 | user_lock *ul = (user_lock *) mg->mg_ptr; |
288 | assert(aTHX == PL_sharedsv_space); |
289 | if (ul) { |
7473853a |
290 | recursive_lock_destroy(aTHX_ &ul->lock); |
291 | COND_DESTROY(&ul->user_cond); |
292 | PerlMemShared_free(ul); |
293 | mg->mg_ptr = NULL; |
21312124 |
294 | } |
7473853a |
295 | return (0); |
21312124 |
296 | } |
297 | |
7473853a |
298 | MGVTBL sharedsv_userlock_vtbl = { |
299 | 0, /* get */ |
300 | 0, /* set */ |
301 | 0, /* len */ |
302 | 0, /* clear */ |
303 | sharedsv_userlock_free, /* free */ |
304 | 0, /* copy */ |
305 | 0, /* dup */ |
306 | #ifdef MGf_LOCAL |
307 | 0, /* local */ |
308 | #endif |
21312124 |
309 | }; |
310 | |
7473853a |
311 | /* |
312 | * Access to shared things is heavily based on MAGIC |
313 | * - in mg.h/mg.c/sv.c sense |
314 | */ |
21312124 |
315 | |
316 | /* In any thread that has access to a shared thing there is a "proxy" |
317 | for it in its own space which has 'MAGIC' associated which accesses |
318 | the shared thing. |
319 | */ |
320 | |
3bc7ad01 |
321 | extern MGVTBL sharedsv_scalar_vtbl; /* Scalars have this vtable */ |
322 | extern MGVTBL sharedsv_array_vtbl; /* Hashes and arrays have this |
323 | - like 'tie' */ |
324 | extern MGVTBL sharedsv_elem_vtbl; /* Elements of hashes and arrays have |
325 | this _AS WELL AS_ the scalar magic: |
29ecdb6f |
326 | The sharedsv_elem_vtbl associates the element with the array/hash and |
21312124 |
327 | the sharedsv_scalar_vtbl associates it with the value |
328 | */ |
329 | |
6b85e4fe |
330 | |
7473853a |
331 | /* Get shared aggregate SV pointed to by threads::shared::tie magic object */ |
29ecdb6f |
332 | |
333 | STATIC SV * |
334 | S_sharedsv_from_obj(pTHX_ SV *sv) |
6b85e4fe |
335 | { |
7473853a |
336 | return ((SvROK(sv)) ? INT2PTR(SV *, SvIV(SvRV(sv))) : NULL); |
29ecdb6f |
337 | } |
338 | |
339 | |
340 | /* Return the user_lock structure (if any) associated with a shared SV. |
7473853a |
341 | * If create is true, create one if it doesn't exist |
342 | */ |
29ecdb6f |
343 | STATIC user_lock * |
344 | S_get_userlock(pTHX_ SV* ssv, bool create) |
345 | { |
346 | MAGIC *mg; |
347 | user_lock *ul = NULL; |
348 | |
349 | assert(ssv); |
7473853a |
350 | /* XXX Redesign the storage of user locks so we don't need a global |
29ecdb6f |
351 | * lock to access them ???? DAPM */ |
352 | ENTER_LOCK; |
353 | mg = mg_find(ssv, PERL_MAGIC_ext); |
7473853a |
354 | if (mg) { |
355 | ul = (user_lock*)(mg->mg_ptr); |
356 | } else if (create) { |
357 | dTHXc; |
358 | SHARED_CONTEXT; |
359 | ul = (user_lock *) PerlMemShared_malloc(sizeof(user_lock)); |
360 | Zero(ul, 1, user_lock); |
361 | /* Attach to shared SV using ext magic */ |
362 | sv_magicext(ssv, NULL, PERL_MAGIC_ext, &sharedsv_userlock_vtbl, |
363 | (char *)ul, 0); |
364 | recursive_lock_init(aTHX_ &ul->lock); |
365 | COND_INIT(&ul->user_cond); |
366 | CALLER_CONTEXT; |
29ecdb6f |
367 | } |
368 | LEAVE_LOCK; |
7473853a |
369 | return (ul); |
6b85e4fe |
370 | } |
371 | |
29ecdb6f |
372 | |
ba2940ce |
373 | /* Given a private side SV tries to find if the SV has a shared backend, |
374 | * by looking for the magic. |
375 | */ |
29ecdb6f |
376 | SV * |
21312124 |
377 | Perl_sharedsv_find(pTHX_ SV *sv) |
378 | { |
379 | MAGIC *mg; |
a446a88f |
380 | if (SvTYPE(sv) >= SVt_PVMG) { |
7473853a |
381 | switch(SvTYPE(sv)) { |
382 | case SVt_PVAV: |
383 | case SVt_PVHV: |
384 | if ((mg = mg_find(sv, PERL_MAGIC_tied)) |
385 | && mg->mg_virtual == &sharedsv_array_vtbl) { |
386 | return ((SV *)mg->mg_ptr); |
387 | } |
388 | break; |
389 | default: |
390 | /* This should work for elements as well as they |
391 | * have scalar magic as well as their element magic |
392 | */ |
393 | if ((mg = mg_find(sv, PERL_MAGIC_shared_scalar)) |
394 | && mg->mg_virtual == &sharedsv_scalar_vtbl) { |
395 | return ((SV *)mg->mg_ptr); |
396 | } |
397 | break; |
398 | } |
21312124 |
399 | } |
6b85e4fe |
400 | /* Just for tidyness of API also handle tie objects */ |
401 | if (SvROK(sv) && sv_derived_from(sv, "threads::shared::tie")) { |
7473853a |
402 | return (S_sharedsv_from_obj(aTHX_ sv)); |
6b85e4fe |
403 | } |
7473853a |
404 | return (NULL); |
21312124 |
405 | } |
68795e93 |
406 | |
68795e93 |
407 | |
7473853a |
408 | /* Associate a private SV with a shared SV by pointing the appropriate |
409 | * magics at it. |
410 | * Assumes lock is held. |
411 | */ |
29ecdb6f |
412 | void |
413 | Perl_sharedsv_associate(pTHX_ SV *sv, SV *ssv) |
21312124 |
414 | { |
21312124 |
415 | dTHXc; |
a446a88f |
416 | MAGIC *mg = 0; |
a446a88f |
417 | |
29ecdb6f |
418 | /* If we are asked for any private ops we need a thread */ |
a446a88f |
419 | assert ( aTHX != PL_sharedsv_space ); |
420 | |
421 | /* To avoid need for recursive locks require caller to hold lock */ |
6d56dc1c |
422 | assert ( PL_sharedsv_lock.owner == aTHX ); |
6b85e4fe |
423 | |
29ecdb6f |
424 | switch(SvTYPE(sv)) { |
425 | case SVt_PVAV: |
426 | case SVt_PVHV: |
7473853a |
427 | if (!(mg = mg_find(sv, PERL_MAGIC_tied)) |
428 | || mg->mg_virtual != &sharedsv_array_vtbl |
429 | || (SV*) mg->mg_ptr != ssv) |
430 | { |
431 | SV *obj = newSV(0); |
432 | sv_setref_iv(obj, "threads::shared::tie", PTR2IV(ssv)); |
433 | if (mg) { |
434 | sv_unmagic(sv, PERL_MAGIC_tied); |
435 | } |
436 | mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl, |
437 | (char *)ssv, 0); |
438 | mg->mg_flags |= (MGf_COPY|MGf_DUP); |
439 | SvREFCNT_inc_void(ssv); |
440 | SvREFCNT_dec(obj); |
441 | } |
442 | break; |
68795e93 |
443 | |
29ecdb6f |
444 | default: |
7473853a |
445 | if ((SvTYPE(sv) < SVt_PVMG) |
446 | || !(mg = mg_find(sv, PERL_MAGIC_shared_scalar)) |
447 | || mg->mg_virtual != &sharedsv_scalar_vtbl |
448 | || (SV*) mg->mg_ptr != ssv) |
449 | { |
450 | if (mg) { |
451 | sv_unmagic(sv, PERL_MAGIC_shared_scalar); |
452 | } |
453 | mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar, |
454 | &sharedsv_scalar_vtbl, (char *)ssv, 0); |
455 | mg->mg_flags |= (MGf_DUP |
456 | #ifdef MGf_LOCAL |
457 | |MGf_LOCAL |
458 | #endif |
459 | ); |
460 | SvREFCNT_inc_void(ssv); |
461 | } |
462 | break; |
21312124 |
463 | } |
7473853a |
464 | |
29ecdb6f |
465 | assert ( Perl_sharedsv_find(aTHX_ sv) == ssv ); |
466 | } |
6b85e4fe |
467 | |
6b85e4fe |
468 | |
29ecdb6f |
469 | /* Given a private SV, create and return an associated shared SV. |
7473853a |
470 | * Assumes lock is held. |
471 | */ |
29ecdb6f |
472 | STATIC SV * |
473 | S_sharedsv_new_shared(pTHX_ SV *sv) |
474 | { |
475 | dTHXc; |
476 | SV *ssv; |
6b85e4fe |
477 | |
29ecdb6f |
478 | assert(PL_sharedsv_lock.owner == aTHX); |
479 | assert(aTHX != PL_sharedsv_space); |
68795e93 |
480 | |
29ecdb6f |
481 | SHARED_CONTEXT; |
482 | ssv = newSV(0); |
7473853a |
483 | SvREFCNT(ssv) = 0; /* Will be upped to 1 by Perl_sharedsv_associate */ |
29ecdb6f |
484 | sv_upgrade(ssv, SvTYPE(sv)); |
485 | CALLER_CONTEXT; |
486 | Perl_sharedsv_associate(aTHX_ sv, ssv); |
7473853a |
487 | return (ssv); |
29ecdb6f |
488 | } |
21312124 |
489 | |
21312124 |
490 | |
29ecdb6f |
491 | /* Given a shared SV, create and return an associated private SV. |
7473853a |
492 | * Assumes lock is held. |
493 | */ |
29ecdb6f |
494 | STATIC SV * |
495 | S_sharedsv_new_private(pTHX_ SV *ssv) |
496 | { |
497 | SV *sv; |
498 | |
499 | assert(PL_sharedsv_lock.owner == aTHX); |
500 | assert(aTHX != PL_sharedsv_space); |
501 | |
502 | sv = newSV(0); |
503 | sv_upgrade(sv, SvTYPE(ssv)); |
504 | Perl_sharedsv_associate(aTHX_ sv, ssv); |
7473853a |
505 | return (sv); |
21312124 |
506 | } |
68795e93 |
507 | |
29ecdb6f |
508 | |
7473853a |
509 | /* A threadsafe version of SvREFCNT_dec(ssv) */ |
29ecdb6f |
510 | |
511 | STATIC void |
512 | S_sharedsv_dec(pTHX_ SV* ssv) |
68795e93 |
513 | { |
7473853a |
514 | if (! ssv) |
515 | return; |
29ecdb6f |
516 | ENTER_LOCK; |
517 | if (SvREFCNT(ssv) > 1) { |
7473853a |
518 | /* No side effects, so can do it lightweight */ |
519 | SvREFCNT_dec(ssv); |
520 | } else { |
521 | dTHXc; |
522 | SHARED_CONTEXT; |
523 | SvREFCNT_dec(ssv); |
524 | CALLER_CONTEXT; |
21312124 |
525 | } |
29ecdb6f |
526 | LEAVE_LOCK; |
68795e93 |
527 | } |
528 | |
7473853a |
529 | |
530 | /* Implements Perl-level share() and :shared */ |
29ecdb6f |
531 | |
21312124 |
532 | void |
533 | Perl_sharedsv_share(pTHX_ SV *sv) |
534 | { |
535 | switch(SvTYPE(sv)) { |
536 | case SVt_PVGV: |
7473853a |
537 | Perl_croak(aTHX_ "Cannot share globs yet"); |
538 | break; |
21312124 |
539 | |
540 | case SVt_PVCV: |
7473853a |
541 | Perl_croak(aTHX_ "Cannot share subs yet"); |
542 | break; |
85e0a142 |
543 | |
21312124 |
544 | default: |
7473853a |
545 | ENTER_LOCK; |
546 | (void) S_sharedsv_new_shared(aTHX_ sv); |
547 | LEAVE_LOCK; |
548 | SvSETMAGIC(sv); |
549 | break; |
21312124 |
550 | } |
551 | } |
68795e93 |
552 | |
7473853a |
553 | |
a0e036c1 |
554 | #if defined(WIN32) || defined(OS2) |
7473853a |
555 | # define ABS2RELMILLI(abs) \ |
a0e036c1 |
556 | do { \ |
2666606c |
557 | abs -= (double)time(NULL); \ |
a0e036c1 |
558 | if (abs > 0) { abs *= 1000; } \ |
559 | else { abs = 0; } \ |
560 | } while (0) |
561 | #endif /* WIN32 || OS2 */ |
562 | |
7473853a |
563 | /* Do OS-specific condition timed wait */ |
29ecdb6f |
564 | |
a0e036c1 |
565 | bool |
566 | Perl_sharedsv_cond_timedwait(perl_cond *cond, perl_mutex *mut, double abs) |
567 | { |
568 | #if defined(NETWARE) || defined(FAKE_THREADS) || defined(I_MACH_CTHREADS) |
569 | Perl_croak_nocontext("cond_timedwait not supported on this platform"); |
570 | #else |
571 | # ifdef WIN32 |
572 | int got_it = 0; |
573 | |
574 | ABS2RELMILLI(abs); |
575 | |
576 | cond->waiters++; |
577 | MUTEX_UNLOCK(mut); |
578 | /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */ |
028f8eaa |
579 | switch (WaitForSingleObject(cond->sem, (DWORD)abs)) { |
a0e036c1 |
580 | case WAIT_OBJECT_0: got_it = 1; break; |
581 | case WAIT_TIMEOUT: break; |
582 | default: |
583 | /* WAIT_FAILED? WAIT_ABANDONED? others? */ |
584 | Perl_croak_nocontext("panic: cond_timedwait (%ld)",GetLastError()); |
585 | break; |
586 | } |
587 | MUTEX_LOCK(mut); |
2666606c |
588 | cond->waiters--; |
7473853a |
589 | return (got_it); |
a0e036c1 |
590 | # else |
591 | # ifdef OS2 |
592 | int rc, got_it = 0; |
593 | STRLEN n_a; |
594 | |
595 | ABS2RELMILLI(abs); |
596 | |
597 | if ((rc = DosResetEventSem(*cond,&n_a)) && (rc != ERROR_ALREADY_RESET)) |
598 | Perl_rc = rc, croak_with_os2error("panic: cond_timedwait-reset"); |
599 | MUTEX_UNLOCK(mut); |
600 | if (CheckOSError(DosWaitEventSem(*cond,abs)) |
601 | && (rc != ERROR_INTERRUPT)) |
602 | croak_with_os2error("panic: cond_timedwait"); |
603 | if (rc == ERROR_INTERRUPT) errno = EINTR; |
604 | MUTEX_LOCK(mut); |
7473853a |
605 | return (got_it); |
606 | # else /* Hope you're I_PTHREAD! */ |
a0e036c1 |
607 | struct timespec ts; |
608 | int got_it = 0; |
609 | |
610 | ts.tv_sec = (long)abs; |
611 | abs -= (NV)ts.tv_sec; |
612 | ts.tv_nsec = (long)(abs * 1000000000.0); |
613 | |
614 | switch (pthread_cond_timedwait(cond, mut, &ts)) { |
615 | case 0: got_it = 1; break; |
616 | case ETIMEDOUT: break; |
cf0d1c66 |
617 | #ifdef OEMVS |
618 | case -1: |
7473853a |
619 | if (errno == ETIMEDOUT || errno == EAGAIN) |
620 | break; |
cf0d1c66 |
621 | #endif |
a0e036c1 |
622 | default: |
623 | Perl_croak_nocontext("panic: cond_timedwait"); |
624 | break; |
625 | } |
7473853a |
626 | return (got_it); |
a0e036c1 |
627 | # endif /* OS2 */ |
628 | # endif /* WIN32 */ |
629 | #endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */ |
630 | } |
631 | |
dad67c22 |
632 | |
7473853a |
633 | /* Given a shared RV, copy it's value to a private RV, also copying the |
dad67c22 |
634 | * object status of the referent. |
635 | * If the private side is already an appropriate RV->SV combination, keep |
636 | * it if possible. |
637 | */ |
dad67c22 |
638 | STATIC void |
639 | S_get_RV(pTHX_ SV *sv, SV *ssv) { |
640 | SV *sobj = SvRV(ssv); |
641 | SV *obj; |
7473853a |
642 | if (! (SvROK(sv) && |
643 | ((obj = SvRV(sv))) && |
644 | (Perl_sharedsv_find(aTHX_ obj) == sobj) && |
645 | (SvTYPE(obj) == SvTYPE(sobj)))) |
dad67c22 |
646 | { |
7473853a |
647 | /* Can't reuse obj */ |
648 | if (SvROK(sv)) { |
649 | SvREFCNT_dec(SvRV(sv)); |
650 | } else { |
651 | assert(SvTYPE(sv) >= SVt_RV); |
652 | sv_setsv_nomg(sv, &PL_sv_undef); |
653 | SvROK_on(sv); |
654 | } |
655 | obj = S_sharedsv_new_private(aTHX_ SvRV(ssv)); |
656 | SvRV_set(sv, obj); |
dad67c22 |
657 | } |
658 | |
659 | if (SvOBJECT(obj)) { |
7473853a |
660 | /* Remove any old blessing */ |
661 | SvREFCNT_dec(SvSTASH(obj)); |
662 | SvOBJECT_off(obj); |
dad67c22 |
663 | } |
664 | if (SvOBJECT(sobj)) { |
7473853a |
665 | /* Add any new old blessing */ |
666 | STRLEN len; |
667 | char* stash_ptr = SvPV((SV*) SvSTASH(sobj), len); |
668 | HV* stash = gv_stashpvn(stash_ptr, len, TRUE); |
669 | SvOBJECT_on(obj); |
670 | SvSTASH_set(obj, (HV*)SvREFCNT_inc(stash)); |
dad67c22 |
671 | } |
672 | } |
673 | |
674 | |
29ecdb6f |
675 | /* ------------ PERL_MAGIC_shared_scalar(n) functions -------------- */ |
676 | |
7473853a |
677 | /* Get magic for PERL_MAGIC_shared_scalar(n) */ |
68795e93 |
678 | |
21312124 |
679 | int |
680 | sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
681 | { |
29ecdb6f |
682 | SV *ssv = (SV *) mg->mg_ptr; |
683 | assert(ssv); |
21312124 |
684 | |
6d56dc1c |
685 | ENTER_LOCK; |
29ecdb6f |
686 | if (SvROK(ssv)) { |
7473853a |
687 | S_get_RV(aTHX_ sv, ssv); |
688 | } else { |
689 | sv_setsv_nomg(sv, ssv); |
21312124 |
690 | } |
6d56dc1c |
691 | LEAVE_LOCK; |
7473853a |
692 | return (0); |
21312124 |
693 | } |
694 | |
7473853a |
695 | /* Copy the contents of a private SV to a shared SV. |
696 | * Used by various mg_set()-type functions. |
697 | * Assumes lock is held. |
698 | */ |
6b85e4fe |
699 | void |
29ecdb6f |
700 | sharedsv_scalar_store(pTHX_ SV *sv, SV *ssv) |
21312124 |
701 | { |
702 | dTHXc; |
21312124 |
703 | bool allowed = TRUE; |
29ecdb6f |
704 | |
705 | assert(PL_sharedsv_lock.owner == aTHX); |
21312124 |
706 | if (SvROK(sv)) { |
7473853a |
707 | SV *obj = SvRV(sv); |
708 | SV *sobj = Perl_sharedsv_find(aTHX_ obj); |
709 | if (sobj) { |
710 | SHARED_CONTEXT; |
711 | SvUPGRADE(ssv, SVt_RV); |
712 | sv_setsv_nomg(ssv, &PL_sv_undef); |
713 | |
714 | SvRV_set(ssv, SvREFCNT_inc(sobj)); |
715 | SvROK_on(ssv); |
716 | if (SvOBJECT(sobj)) { |
717 | /* Remove any old blessing */ |
718 | SvREFCNT_dec(SvSTASH(sobj)); |
719 | SvOBJECT_off(sobj); |
720 | } |
721 | if (SvOBJECT(obj)) { |
722 | SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(obj)),0); |
723 | SvOBJECT_on(sobj); |
724 | SvSTASH_set(sobj, (HV*)fake_stash); |
725 | } |
726 | CALLER_CONTEXT; |
727 | } else { |
728 | allowed = FALSE; |
729 | } |
730 | } else { |
5c360ac5 |
731 | SvTEMP_off(sv); |
7473853a |
732 | SHARED_CONTEXT; |
733 | sv_setsv_nomg(ssv, sv); |
734 | if (SvOBJECT(ssv)) { |
735 | /* Remove any old blessing */ |
736 | SvREFCNT_dec(SvSTASH(ssv)); |
737 | SvOBJECT_off(ssv); |
738 | } |
739 | if (SvOBJECT(sv)) { |
740 | SV* fake_stash = newSVpv(HvNAME_get(SvSTASH(sv)),0); |
741 | SvOBJECT_on(ssv); |
742 | SvSTASH_set(ssv, (HV*)fake_stash); |
743 | } |
744 | CALLER_CONTEXT; |
21312124 |
745 | } |
21312124 |
746 | if (!allowed) { |
7473853a |
747 | Perl_croak(aTHX_ "Invalid value for shared scalar"); |
21312124 |
748 | } |
6b85e4fe |
749 | } |
750 | |
7473853a |
751 | /* Set magic for PERL_MAGIC_shared_scalar(n) */ |
29ecdb6f |
752 | |
6b85e4fe |
753 | int |
754 | sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg) |
755 | { |
29ecdb6f |
756 | SV *ssv = (SV*)(mg->mg_ptr); |
757 | assert(ssv); |
6b85e4fe |
758 | ENTER_LOCK; |
29ecdb6f |
759 | if (SvTYPE(ssv) < SvTYPE(sv)) { |
7473853a |
760 | dTHXc; |
761 | SHARED_CONTEXT; |
762 | sv_upgrade(ssv, SvTYPE(sv)); |
763 | CALLER_CONTEXT; |
29ecdb6f |
764 | } |
765 | sharedsv_scalar_store(aTHX_ sv, ssv); |
6b85e4fe |
766 | LEAVE_LOCK; |
7473853a |
767 | return (0); |
68795e93 |
768 | } |
769 | |
7473853a |
770 | /* Free magic for PERL_MAGIC_shared_scalar(n) */ |
a446a88f |
771 | |
772 | int |
29ecdb6f |
773 | sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg) |
a446a88f |
774 | { |
29ecdb6f |
775 | S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr); |
7473853a |
776 | return (0); |
21312124 |
777 | } |
68795e93 |
778 | |
779 | /* |
29ecdb6f |
780 | * Called during cloning of PERL_MAGIC_shared_scalar(n) magic in new thread |
21312124 |
781 | */ |
782 | int |
783 | sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
784 | { |
7473853a |
785 | SvREFCNT_inc_void(mg->mg_ptr); |
786 | return (0); |
21312124 |
787 | } |
68795e93 |
788 | |
7473853a |
789 | #ifdef MGf_LOCAL |
a5063e7c |
790 | /* |
791 | * Called during local $shared |
792 | */ |
793 | int |
794 | sharedsv_scalar_mg_local(pTHX_ SV* nsv, MAGIC *mg) |
795 | { |
796 | MAGIC *nmg; |
29ecdb6f |
797 | SV *ssv = (SV *) mg->mg_ptr; |
798 | if (ssv) { |
7473853a |
799 | ENTER_LOCK; |
800 | SvREFCNT_inc_void(ssv); |
801 | LEAVE_LOCK; |
a5063e7c |
802 | } |
803 | nmg = sv_magicext(nsv, mg->mg_obj, mg->mg_type, mg->mg_virtual, |
7473853a |
804 | mg->mg_ptr, mg->mg_len); |
a5063e7c |
805 | nmg->mg_flags = mg->mg_flags; |
806 | nmg->mg_private = mg->mg_private; |
807 | |
7473853a |
808 | return (0); |
a5063e7c |
809 | } |
7473853a |
810 | #endif |
a5063e7c |
811 | |
21312124 |
812 | MGVTBL sharedsv_scalar_vtbl = { |
7473853a |
813 | sharedsv_scalar_mg_get, /* get */ |
814 | sharedsv_scalar_mg_set, /* set */ |
815 | 0, /* len */ |
816 | 0, /* clear */ |
817 | sharedsv_scalar_mg_free, /* free */ |
818 | 0, /* copy */ |
819 | sharedsv_scalar_mg_dup, /* dup */ |
820 | #ifdef MGf_LOCAL |
821 | sharedsv_scalar_mg_local, /* local */ |
822 | #endif |
21312124 |
823 | }; |
68795e93 |
824 | |
29ecdb6f |
825 | /* ------------ PERL_MAGIC_tiedelem(p) functions -------------- */ |
826 | |
7473853a |
827 | /* Get magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
828 | |
21312124 |
829 | int |
830 | sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
831 | { |
21312124 |
832 | dTHXc; |
29ecdb6f |
833 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
21312124 |
834 | SV** svp; |
835 | |
6b85e4fe |
836 | ENTER_LOCK; |
29ecdb6f |
837 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
838 | assert ( mg->mg_ptr == 0 ); |
839 | SHARED_CONTEXT; |
840 | svp = av_fetch((AV*) saggregate, mg->mg_len, 0); |
841 | } else { |
842 | char *key = mg->mg_ptr; |
843 | STRLEN len = mg->mg_len; |
844 | assert ( mg->mg_ptr != 0 ); |
845 | if (mg->mg_len == HEf_SVKEY) { |
846 | key = SvPV((SV *) mg->mg_ptr, len); |
847 | } |
848 | SHARED_CONTEXT; |
849 | svp = hv_fetch((HV*) saggregate, key, len, 0); |
21312124 |
850 | } |
6b85e4fe |
851 | CALLER_CONTEXT; |
21312124 |
852 | if (svp) { |
7473853a |
853 | /* Exists in the array */ |
854 | if (SvROK(*svp)) { |
855 | S_get_RV(aTHX_ sv, *svp); |
856 | } else { |
857 | /* XXX Can this branch ever happen? DAPM */ |
858 | /* XXX assert("no such branch"); */ |
859 | Perl_sharedsv_associate(aTHX_ sv, *svp); |
860 | sv_setsv(sv, *svp); |
861 | } |
862 | } else { |
863 | /* Not in the array */ |
864 | sv_setsv(sv, &PL_sv_undef); |
68795e93 |
865 | } |
6b85e4fe |
866 | LEAVE_LOCK; |
7473853a |
867 | return (0); |
68795e93 |
868 | } |
869 | |
7473853a |
870 | /* Set magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
871 | |
21312124 |
872 | int |
873 | sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg) |
874 | { |
875 | dTHXc; |
29ecdb6f |
876 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
6b85e4fe |
877 | SV **svp; |
21312124 |
878 | /* Theory - SV itself is magically shared - and we have ordered the |
879 | magic such that by the time we get here it has been stored |
880 | to its shared counterpart |
881 | */ |
6d56dc1c |
882 | ENTER_LOCK; |
29ecdb6f |
883 | assert(saggregate); |
884 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
885 | assert ( mg->mg_ptr == 0 ); |
886 | SHARED_CONTEXT; |
887 | svp = av_fetch((AV*) saggregate, mg->mg_len, 1); |
888 | } else { |
889 | char *key = mg->mg_ptr; |
890 | STRLEN len = mg->mg_len; |
891 | assert ( mg->mg_ptr != 0 ); |
892 | if (mg->mg_len == HEf_SVKEY) |
893 | key = SvPV((SV *) mg->mg_ptr, len); |
894 | SHARED_CONTEXT; |
895 | svp = hv_fetch((HV*) saggregate, key, len, 1); |
21312124 |
896 | } |
6b85e4fe |
897 | CALLER_CONTEXT; |
29ecdb6f |
898 | Perl_sharedsv_associate(aTHX_ sv, *svp); |
899 | sharedsv_scalar_store(aTHX_ sv, *svp); |
6b85e4fe |
900 | LEAVE_LOCK; |
7473853a |
901 | return (0); |
21312124 |
902 | } |
68795e93 |
903 | |
7473853a |
904 | /* Clear magic for PERL_MAGIC_tiedelem(p) */ |
29ecdb6f |
905 | |
21312124 |
906 | int |
907 | sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg) |
68795e93 |
908 | { |
21312124 |
909 | dTHXc; |
057e91b3 |
910 | MAGIC *shmg; |
29ecdb6f |
911 | SV *saggregate = S_sharedsv_from_obj(aTHX_ mg->mg_obj); |
6b85e4fe |
912 | ENTER_LOCK; |
913 | sharedsv_elem_mg_FETCH(aTHX_ sv, mg); |
057e91b3 |
914 | if ((shmg = mg_find(sv, PERL_MAGIC_shared_scalar))) |
7473853a |
915 | sharedsv_scalar_mg_get(aTHX_ sv, shmg); |
29ecdb6f |
916 | if (SvTYPE(saggregate) == SVt_PVAV) { |
7473853a |
917 | SHARED_CONTEXT; |
918 | av_delete((AV*) saggregate, mg->mg_len, G_DISCARD); |
919 | } else { |
920 | char *key = mg->mg_ptr; |
921 | STRLEN len = mg->mg_len; |
922 | assert ( mg->mg_ptr != 0 ); |
923 | if (mg->mg_len == HEf_SVKEY) |
924 | key = SvPV((SV *) mg->mg_ptr, len); |
925 | SHARED_CONTEXT; |
926 | hv_delete((HV*) saggregate, key, len, G_DISCARD); |
21312124 |
927 | } |
6b85e4fe |
928 | CALLER_CONTEXT; |
929 | LEAVE_LOCK; |
7473853a |
930 | return (0); |
21312124 |
931 | } |
932 | |
29ecdb6f |
933 | /* Called during cloning of PERL_MAGIC_tiedelem(p) magic in new |
934 | * thread */ |
935 | |
21312124 |
936 | int |
937 | sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
938 | { |
7473853a |
939 | SvREFCNT_inc_void(S_sharedsv_from_obj(aTHX_ mg->mg_obj)); |
29ecdb6f |
940 | assert(mg->mg_flags & MGf_DUP); |
7473853a |
941 | return (0); |
21312124 |
942 | } |
943 | |
944 | MGVTBL sharedsv_elem_vtbl = { |
7473853a |
945 | sharedsv_elem_mg_FETCH, /* get */ |
946 | sharedsv_elem_mg_STORE, /* set */ |
947 | 0, /* len */ |
948 | sharedsv_elem_mg_DELETE, /* clear */ |
949 | 0, /* free */ |
950 | 0, /* copy */ |
951 | sharedsv_elem_mg_dup, /* dup */ |
952 | #ifdef MGf_LOCAL |
953 | 0, /* local */ |
954 | #endif |
21312124 |
955 | }; |
956 | |
29ecdb6f |
957 | /* ------------ PERL_MAGIC_tied(P) functions -------------- */ |
958 | |
7473853a |
959 | /* Len magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
960 | |
21312124 |
961 | U32 |
962 | sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg) |
963 | { |
964 | dTHXc; |
29ecdb6f |
965 | SV *ssv = (SV *) mg->mg_ptr; |
21312124 |
966 | U32 val; |
967 | SHARED_EDIT; |
29ecdb6f |
968 | if (SvTYPE(ssv) == SVt_PVAV) { |
7473853a |
969 | val = av_len((AV*) ssv); |
970 | } else { |
971 | /* Not actually defined by tie API but ... */ |
972 | val = HvKEYS((HV*) ssv); |
21312124 |
973 | } |
974 | SHARED_RELEASE; |
7473853a |
975 | return (val); |
21312124 |
976 | } |
977 | |
7473853a |
978 | /* Clear magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
979 | |
21312124 |
980 | int |
981 | sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg) |
982 | { |
983 | dTHXc; |
29ecdb6f |
984 | SV *ssv = (SV *) mg->mg_ptr; |
21312124 |
985 | SHARED_EDIT; |
29ecdb6f |
986 | if (SvTYPE(ssv) == SVt_PVAV) { |
7473853a |
987 | av_clear((AV*) ssv); |
988 | } else { |
989 | hv_clear((HV*) ssv); |
21312124 |
990 | } |
991 | SHARED_RELEASE; |
7473853a |
992 | return (0); |
21312124 |
993 | } |
994 | |
7473853a |
995 | /* Free magic for PERL_MAGIC_tied(P) */ |
29ecdb6f |
996 | |
21312124 |
997 | int |
998 | sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg) |
999 | { |
29ecdb6f |
1000 | S_sharedsv_dec(aTHX_ (SV*)mg->mg_ptr); |
7473853a |
1001 | return (0); |
68795e93 |
1002 | } |
1003 | |
1004 | /* |
7473853a |
1005 | * Copy magic for PERL_MAGIC_tied(P) |
21312124 |
1006 | * This is called when perl is about to access an element of |
1007 | * the array - |
1008 | */ |
1009 | int |
1010 | sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg, |
7473853a |
1011 | SV *nsv, const char *name, int namlen) |
21312124 |
1012 | { |
21312124 |
1013 | MAGIC *nmg = sv_magicext(nsv,mg->mg_obj, |
7473853a |
1014 | toLOWER(mg->mg_type),&sharedsv_elem_vtbl, |
1015 | name, namlen); |
21312124 |
1016 | nmg->mg_flags |= MGf_DUP; |
7473853a |
1017 | return (1); |
21312124 |
1018 | } |
1019 | |
29ecdb6f |
1020 | /* Called during cloning of PERL_MAGIC_tied(P) magic in new thread */ |
1021 | |
21312124 |
1022 | int |
1023 | sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) |
1024 | { |
7473853a |
1025 | SvREFCNT_inc_void((SV*)mg->mg_ptr); |
29ecdb6f |
1026 | assert(mg->mg_flags & MGf_DUP); |
7473853a |
1027 | return (0); |
21312124 |
1028 | } |
1029 | |
1030 | MGVTBL sharedsv_array_vtbl = { |
7473853a |
1031 | 0, /* get */ |
1032 | 0, /* set */ |
1033 | sharedsv_array_mg_FETCHSIZE,/* len */ |
1034 | sharedsv_array_mg_CLEAR, /* clear */ |
1035 | sharedsv_array_mg_free, /* free */ |
1036 | sharedsv_array_mg_copy, /* copy */ |
1037 | sharedsv_array_mg_dup, /* dup */ |
1038 | #ifdef MGf_LOCAL |
1039 | 0, /* local */ |
1040 | #endif |
21312124 |
1041 | }; |
1042 | |
68795e93 |
1043 | |
ba2940ce |
1044 | /* Recursively unlocks a shared sv. */ |
68795e93 |
1045 | |
1046 | void |
29ecdb6f |
1047 | Perl_sharedsv_unlock(pTHX_ SV *ssv) |
68795e93 |
1048 | { |
29ecdb6f |
1049 | user_lock *ul = S_get_userlock(aTHX_ ssv, 0); |
1050 | assert(ul); |
1051 | recursive_lock_release(aTHX_ &ul->lock); |
68795e93 |
1052 | } |
1053 | |
68795e93 |
1054 | |
ba2940ce |
1055 | /* Recursive locks on a sharedsv. |
1056 | * Locks are dynamically scoped at the level of the first lock. |
1057 | */ |
68795e93 |
1058 | void |
29ecdb6f |
1059 | Perl_sharedsv_lock(pTHX_ SV *ssv) |
68795e93 |
1060 | { |
29ecdb6f |
1061 | user_lock *ul; |
7473853a |
1062 | if (! ssv) |
1063 | return; |
29ecdb6f |
1064 | ul = S_get_userlock(aTHX_ ssv, 1); |
1065 | recursive_lock_acquire(aTHX_ &ul->lock, __FILE__, __LINE__); |
68795e93 |
1066 | } |
1067 | |
7473853a |
1068 | /* Handles calls from lock() builtin via PL_lockhook */ |
afe38520 |
1069 | |
21312124 |
1070 | void |
1071 | Perl_sharedsv_locksv(pTHX_ SV *sv) |
1072 | { |
29ecdb6f |
1073 | SV *ssv; |
afe38520 |
1074 | |
7473853a |
1075 | if (SvROK(sv)) |
1076 | sv = SvRV(sv); |
29ecdb6f |
1077 | ssv = Perl_sharedsv_find(aTHX_ sv); |
7473853a |
1078 | if (!ssv) |
afe38520 |
1079 | croak("lock can only be used on shared values"); |
29ecdb6f |
1080 | Perl_sharedsv_lock(aTHX_ ssv); |
b050c948 |
1081 | } |
1082 | |
b050c948 |
1083 | |
ba2940ce |
1084 | /* Saves a space for keeping SVs wider than an interpreter. */ |
21312124 |
1085 | |
1086 | void |
1087 | Perl_sharedsv_init(pTHX) |
1088 | { |
7473853a |
1089 | dTHXc; |
1090 | /* This pair leaves us in shared context ... */ |
1091 | PL_sharedsv_space = perl_alloc(); |
1092 | perl_construct(PL_sharedsv_space); |
1093 | CALLER_CONTEXT; |
1094 | recursive_lock_init(aTHX_ &PL_sharedsv_lock); |
1095 | PL_lockhook = &Perl_sharedsv_locksv; |
1096 | PL_sharehook = &Perl_sharedsv_share; |
b050c948 |
1097 | } |
1098 | |
73e09c8f |
1099 | #endif /* USE_ITHREADS */ |
1100 | |
7473853a |
1101 | MODULE = threads::shared PACKAGE = threads::shared::tie |
b050c948 |
1102 | |
21312124 |
1103 | PROTOTYPES: DISABLE |
b050c948 |
1104 | |
73e09c8f |
1105 | #ifdef USE_ITHREADS |
6b85e4fe |
1106 | |
21312124 |
1107 | void |
29ecdb6f |
1108 | PUSH(SV *obj, ...) |
7473853a |
1109 | CODE: |
1110 | dTHXc; |
1111 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1112 | int i; |
1113 | for (i = 1; i < items; i++) { |
1114 | SV* tmp = newSVsv(ST(i)); |
1115 | SV *stmp; |
1116 | ENTER_LOCK; |
1117 | stmp = S_sharedsv_new_shared(aTHX_ tmp); |
1118 | sharedsv_scalar_store(aTHX_ tmp, stmp); |
1119 | SHARED_CONTEXT; |
1120 | av_push((AV*) sobj, stmp); |
1121 | SvREFCNT_inc_void(stmp); |
1122 | SHARED_RELEASE; |
1123 | SvREFCNT_dec(tmp); |
1124 | } |
1125 | |
b050c948 |
1126 | |
21312124 |
1127 | void |
29ecdb6f |
1128 | UNSHIFT(SV *obj, ...) |
7473853a |
1129 | CODE: |
1130 | dTHXc; |
1131 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1132 | int i; |
1133 | ENTER_LOCK; |
1134 | SHARED_CONTEXT; |
1135 | av_unshift((AV*)sobj, items - 1); |
1136 | CALLER_CONTEXT; |
1137 | for (i = 1; i < items; i++) { |
1138 | SV *tmp = newSVsv(ST(i)); |
1139 | SV *stmp = S_sharedsv_new_shared(aTHX_ tmp); |
1140 | sharedsv_scalar_store(aTHX_ tmp, stmp); |
1141 | SHARED_CONTEXT; |
1142 | av_store((AV*) sobj, i - 1, stmp); |
1143 | SvREFCNT_inc_void(stmp); |
1144 | CALLER_CONTEXT; |
1145 | SvREFCNT_dec(tmp); |
1146 | } |
1147 | LEAVE_LOCK; |
1148 | |
b050c948 |
1149 | |
21312124 |
1150 | void |
29ecdb6f |
1151 | POP(SV *obj) |
7473853a |
1152 | CODE: |
1153 | dTHXc; |
1154 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1155 | SV* ssv; |
1156 | ENTER_LOCK; |
1157 | SHARED_CONTEXT; |
1158 | ssv = av_pop((AV*)sobj); |
1159 | CALLER_CONTEXT; |
1160 | ST(0) = sv_newmortal(); |
1161 | Perl_sharedsv_associate(aTHX_ ST(0), ssv); |
1162 | SvREFCNT_dec(ssv); |
1163 | LEAVE_LOCK; |
1164 | /* XSRETURN(1); - implied */ |
1165 | |
b050c948 |
1166 | |
21312124 |
1167 | void |
29ecdb6f |
1168 | SHIFT(SV *obj) |
7473853a |
1169 | CODE: |
1170 | dTHXc; |
1171 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1172 | SV* ssv; |
1173 | ENTER_LOCK; |
1174 | SHARED_CONTEXT; |
1175 | ssv = av_shift((AV*)sobj); |
1176 | CALLER_CONTEXT; |
1177 | ST(0) = sv_newmortal(); |
1178 | Perl_sharedsv_associate(aTHX_ ST(0), ssv); |
1179 | SvREFCNT_dec(ssv); |
1180 | LEAVE_LOCK; |
1181 | /* XSRETURN(1); - implied */ |
1182 | |
b050c948 |
1183 | |
21312124 |
1184 | void |
29ecdb6f |
1185 | EXTEND(SV *obj, IV count) |
7473853a |
1186 | CODE: |
1187 | dTHXc; |
1188 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1189 | SHARED_EDIT; |
1190 | av_extend((AV*)sobj, count); |
1191 | SHARED_RELEASE; |
1192 | |
b050c948 |
1193 | |
21312124 |
1194 | void |
29ecdb6f |
1195 | STORESIZE(SV *obj,IV count) |
7473853a |
1196 | CODE: |
1197 | dTHXc; |
1198 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1199 | SHARED_EDIT; |
1200 | av_fill((AV*) sobj, count); |
1201 | SHARED_RELEASE; |
6b85e4fe |
1202 | |
1203 | |
1204 | void |
29ecdb6f |
1205 | EXISTS(SV *obj, SV *index) |
7473853a |
1206 | CODE: |
1207 | dTHXc; |
1208 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1209 | bool exists; |
1210 | if (SvTYPE(sobj) == SVt_PVAV) { |
1211 | SHARED_EDIT; |
1212 | exists = av_exists((AV*) sobj, SvIV(index)); |
1213 | } else { |
1214 | STRLEN len; |
1215 | char *key = SvPV(index,len); |
1216 | SHARED_EDIT; |
1217 | exists = hv_exists((HV*) sobj, key, len); |
1218 | } |
1219 | SHARED_RELEASE; |
1220 | ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no; |
1221 | /* XSRETURN(1); - implied */ |
b050c948 |
1222 | |
1223 | |
1224 | void |
29ecdb6f |
1225 | FIRSTKEY(SV *obj) |
7473853a |
1226 | CODE: |
1227 | dTHXc; |
1228 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1229 | char* key = NULL; |
1230 | I32 len = 0; |
1231 | HE* entry; |
1232 | ENTER_LOCK; |
1233 | SHARED_CONTEXT; |
1234 | hv_iterinit((HV*) sobj); |
1235 | entry = hv_iternext((HV*) sobj); |
1236 | if (entry) { |
1237 | key = hv_iterkey(entry,&len); |
1238 | CALLER_CONTEXT; |
1239 | ST(0) = sv_2mortal(newSVpv(key, len)); |
1240 | } else { |
1241 | CALLER_CONTEXT; |
1242 | ST(0) = &PL_sv_undef; |
1243 | } |
1244 | LEAVE_LOCK; |
1245 | /* XSRETURN(1); - implied */ |
1246 | |
b050c948 |
1247 | |
866fba46 |
1248 | void |
29ecdb6f |
1249 | NEXTKEY(SV *obj, SV *oldkey) |
7473853a |
1250 | CODE: |
1251 | dTHXc; |
1252 | SV *sobj = S_sharedsv_from_obj(aTHX_ obj); |
1253 | char* key = NULL; |
1254 | I32 len = 0; |
1255 | HE* entry; |
1256 | ENTER_LOCK; |
1257 | SHARED_CONTEXT; |
1258 | entry = hv_iternext((HV*) sobj); |
1259 | if (entry) { |
1260 | key = hv_iterkey(entry,&len); |
1261 | CALLER_CONTEXT; |
1262 | ST(0) = sv_2mortal(newSVpv(key, len)); |
1263 | } else { |
1264 | CALLER_CONTEXT; |
1265 | ST(0) = &PL_sv_undef; |
1266 | } |
1267 | LEAVE_LOCK; |
1268 | /* XSRETURN(1); - implied */ |
1269 | |
1270 | |
1271 | MODULE = threads::shared PACKAGE = threads::shared |
21312124 |
1272 | |
1273 | PROTOTYPES: ENABLE |
866fba46 |
1274 | |
68795e93 |
1275 | void |
9c4972d9 |
1276 | _id(SV *ref) |
7473853a |
1277 | PROTOTYPE: \[$@%] |
1278 | PREINIT: |
1279 | SV *ssv; |
1280 | CODE: |
1281 | ref = SvRV(ref); |
1282 | if (SvROK(ref)) |
1283 | ref = SvRV(ref); |
1284 | ssv = Perl_sharedsv_find(aTHX_ ref); |
1285 | if (! ssv) |
1286 | XSRETURN_UNDEF; |
1287 | ST(0) = sv_2mortal(newSVuv(PTR2UV(ssv))); |
1288 | /* XSRETURN(1); - implied */ |
9c4972d9 |
1289 | |
1290 | |
1291 | void |
6b85e4fe |
1292 | _refcnt(SV *ref) |
7473853a |
1293 | PROTOTYPE: \[$@%] |
1294 | PREINIT: |
1295 | SV *ssv; |
1296 | CODE: |
1297 | ref = SvRV(ref); |
1298 | if (SvROK(ref)) |
1299 | ref = SvRV(ref); |
1300 | ssv = Perl_sharedsv_find(aTHX_ ref); |
1301 | if (! ssv) { |
1302 | Perl_warn(aTHX_ "%" SVf " is not shared", ST(0)); |
1303 | XSRETURN_UNDEF; |
1304 | } |
1305 | ST(0) = sv_2mortal(newSViv(SvREFCNT(ssv))); |
1306 | /* XSRETURN(1); - implied */ |
1307 | |
1308 | |
1309 | void |
a446a88f |
1310 | share(SV *ref) |
7473853a |
1311 | PROTOTYPE: \[$@%] |
1312 | CODE: |
1313 | if (! SvROK(ref)) |
56fcff86 |
1314 | Perl_croak(aTHX_ "Argument to share needs to be passed as ref"); |
7473853a |
1315 | ref = SvRV(ref); |
1316 | if (SvROK(ref)) |
1317 | ref = SvRV(ref); |
1318 | Perl_sharedsv_share(aTHX_ ref); |
1319 | ST(0) = sv_2mortal(newRV_inc(ref)); |
1320 | /* XSRETURN(1); - implied */ |
a446a88f |
1321 | |
6f942b98 |
1322 | |
1323 | void |
7473853a |
1324 | cond_wait(SV *ref_cond, SV *ref_lock = 0) |
1325 | PROTOTYPE: \[$@%];\[$@%] |
1326 | PREINIT: |
1327 | SV *ssv; |
1328 | perl_cond* user_condition; |
1329 | int locks; |
1330 | user_lock *ul; |
1331 | CODE: |
1332 | if (!SvROK(ref_cond)) |
56fcff86 |
1333 | Perl_croak(aTHX_ "Argument to cond_wait needs to be passed as ref"); |
7473853a |
1334 | ref_cond = SvRV(ref_cond); |
1335 | if (SvROK(ref_cond)) |
1336 | ref_cond = SvRV(ref_cond); |
1337 | ssv = Perl_sharedsv_find(aTHX_ ref_cond); |
1338 | if (! ssv) |
1339 | Perl_croak(aTHX_ "cond_wait can only be used on shared values"); |
1340 | ul = S_get_userlock(aTHX_ ssv, 1); |
1341 | |
1342 | user_condition = &ul->user_cond; |
1343 | if (ref_lock && (ref_cond != ref_lock)) { |
1344 | if (!SvROK(ref_lock)) |
1345 | Perl_croak(aTHX_ "cond_wait lock needs to be passed as ref"); |
1346 | ref_lock = SvRV(ref_lock); |
1347 | if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock); |
1348 | ssv = Perl_sharedsv_find(aTHX_ ref_lock); |
1349 | if (! ssv) |
1350 | Perl_croak(aTHX_ "cond_wait lock must be a shared value"); |
1351 | ul = S_get_userlock(aTHX_ ssv, 1); |
1352 | } |
1353 | if (ul->lock.owner != aTHX) |
1354 | croak("You need a lock before you can cond_wait"); |
ba2940ce |
1355 | |
7473853a |
1356 | /* Stealing the members of the lock object worries me - NI-S */ |
1357 | MUTEX_LOCK(&ul->lock.mutex); |
1358 | ul->lock.owner = NULL; |
1359 | locks = ul->lock.locks; |
1360 | ul->lock.locks = 0; |
1361 | |
ba2940ce |
1362 | /* Since we are releasing the lock here, we need to tell other |
1363 | * people that it is ok to go ahead and use it */ |
7473853a |
1364 | COND_SIGNAL(&ul->lock.cond); |
1365 | COND_WAIT(user_condition, &ul->lock.mutex); |
ba2940ce |
1366 | while (ul->lock.owner != NULL) { |
7473853a |
1367 | /* OK -- must reacquire the lock */ |
1368 | COND_WAIT(&ul->lock.cond, &ul->lock.mutex); |
1369 | } |
1370 | ul->lock.owner = aTHX; |
1371 | ul->lock.locks = locks; |
1372 | MUTEX_UNLOCK(&ul->lock.mutex); |
1373 | |
a0e036c1 |
1374 | |
1375 | int |
7473853a |
1376 | cond_timedwait(SV *ref_cond, double abs, SV *ref_lock = 0) |
1377 | PROTOTYPE: \[$@%]$;\[$@%] |
1378 | PREINIT: |
1379 | SV *ssv; |
1380 | perl_cond* user_condition; |
1381 | int locks; |
1382 | user_lock *ul; |
1383 | CODE: |
1384 | if (! SvROK(ref_cond)) |
1385 | Perl_croak(aTHX_ "Argument to cond_timedwait needs to be passed as ref"); |
1386 | ref_cond = SvRV(ref_cond); |
1387 | if (SvROK(ref_cond)) |
1388 | ref_cond = SvRV(ref_cond); |
1389 | ssv = Perl_sharedsv_find(aTHX_ ref_cond); |
1390 | if (! ssv) |
1391 | Perl_croak(aTHX_ "cond_timedwait can only be used on shared values"); |
1392 | ul = S_get_userlock(aTHX_ ssv, 1); |
1393 | |
1394 | user_condition = &ul->user_cond; |
1395 | if (ref_lock && (ref_cond != ref_lock)) { |
1396 | if (! SvROK(ref_lock)) |
1397 | Perl_croak(aTHX_ "cond_timedwait lock needs to be passed as ref"); |
1398 | ref_lock = SvRV(ref_lock); |
1399 | if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock); |
1400 | ssv = Perl_sharedsv_find(aTHX_ ref_lock); |
1401 | if (! ssv) |
1402 | Perl_croak(aTHX_ "cond_timedwait lock must be a shared value"); |
1403 | ul = S_get_userlock(aTHX_ ssv, 1); |
1404 | } |
1405 | if (ul->lock.owner != aTHX) |
1406 | Perl_croak(aTHX_ "You need a lock before you can cond_wait"); |
1407 | |
1408 | MUTEX_LOCK(&ul->lock.mutex); |
1409 | ul->lock.owner = NULL; |
1410 | locks = ul->lock.locks; |
1411 | ul->lock.locks = 0; |
ba2940ce |
1412 | /* Since we are releasing the lock here, we need to tell other |
1413 | * people that it is ok to go ahead and use it */ |
7473853a |
1414 | COND_SIGNAL(&ul->lock.cond); |
1415 | RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &ul->lock.mutex, abs); |
1416 | while (ul->lock.owner != NULL) { |
1417 | /* OK -- must reacquire the lock... */ |
1418 | COND_WAIT(&ul->lock.cond, &ul->lock.mutex); |
1419 | } |
1420 | ul->lock.owner = aTHX; |
1421 | ul->lock.locks = locks; |
1422 | MUTEX_UNLOCK(&ul->lock.mutex); |
1423 | |
1424 | if (RETVAL == 0) |
a0e036c1 |
1425 | XSRETURN_UNDEF; |
7473853a |
1426 | OUTPUT: |
1427 | RETVAL |
a0e036c1 |
1428 | |
29ecdb6f |
1429 | |
7473853a |
1430 | void |
1431 | cond_signal(SV *ref) |
1432 | PROTOTYPE: \[$@%] |
1433 | PREINIT: |
1434 | SV *ssv; |
1435 | user_lock *ul; |
1436 | CODE: |
1437 | if (! SvROK(ref)) |
56fcff86 |
1438 | Perl_croak(aTHX_ "Argument to cond_signal needs to be passed as ref"); |
7473853a |
1439 | ref = SvRV(ref); |
1440 | if (SvROK(ref)) |
1441 | ref = SvRV(ref); |
1442 | ssv = Perl_sharedsv_find(aTHX_ ref); |
1443 | if (! ssv) |
1444 | Perl_croak(aTHX_ "cond_signal can only be used on shared values"); |
1445 | ul = S_get_userlock(aTHX_ ssv, 1); |
1446 | if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) { |
1447 | Perl_warner(aTHX_ packWARN(WARN_THREADS), |
1448 | "cond_signal() called on unlocked variable"); |
1449 | } |
1450 | COND_SIGNAL(&ul->user_cond); |
6f942b98 |
1451 | |
29ecdb6f |
1452 | |
7473853a |
1453 | void |
1454 | cond_broadcast(SV *ref) |
1455 | PROTOTYPE: \[$@%] |
1456 | PREINIT: |
1457 | SV *ssv; |
1458 | user_lock *ul; |
1459 | CODE: |
1460 | if (! SvROK(ref)) |
56fcff86 |
1461 | Perl_croak(aTHX_ "Argument to cond_broadcast needs to be passed as ref"); |
7473853a |
1462 | ref = SvRV(ref); |
1463 | if (SvROK(ref)) |
1464 | ref = SvRV(ref); |
1465 | ssv = Perl_sharedsv_find(aTHX_ ref); |
1466 | if (! ssv) |
1467 | Perl_croak(aTHX_ "cond_broadcast can only be used on shared values"); |
1468 | ul = S_get_userlock(aTHX_ ssv, 1); |
1469 | if (ckWARN(WARN_THREADS) && ul->lock.owner != aTHX) { |
1470 | Perl_warner(aTHX_ packWARN(WARN_THREADS), |
1471 | "cond_broadcast() called on unlocked variable"); |
1472 | } |
1473 | COND_BROADCAST(&ul->user_cond); |
1474 | |
1475 | |
1476 | void |
5c360ac5 |
1477 | bless(SV* ref, ...); |
7473853a |
1478 | PROTOTYPE: $;$ |
1479 | PREINIT: |
1480 | HV* stash; |
1481 | SV *ssv; |
1482 | CODE: |
1483 | if (items == 1) { |
1484 | stash = CopSTASH(PL_curcop); |
1485 | } else { |
1486 | SV* classname = ST(1); |
1487 | STRLEN len; |
1488 | char *ptr; |
1489 | |
1490 | if (classname && |
1491 | ! SvGMAGICAL(classname) && |
1492 | ! SvAMAGIC(classname) && |
1493 | SvROK(classname)) |
1494 | { |
1495 | Perl_croak(aTHX_ "Attempt to bless into a reference"); |
1496 | } |
1497 | ptr = SvPV(classname, len); |
1498 | if (ckWARN(WARN_MISC) && len == 0) { |
1499 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
1500 | "Explicit blessing to '' (assuming package main)"); |
1501 | } |
1502 | stash = gv_stashpvn(ptr, len, TRUE); |
1503 | } |
1504 | SvREFCNT_inc_void(ref); |
1505 | (void)sv_bless(ref, stash); |
1506 | ST(0) = sv_2mortal(ref); |
1507 | ssv = Perl_sharedsv_find(aTHX_ ref); |
1508 | if (ssv) { |
1509 | dTHXc; |
1510 | ENTER_LOCK; |
1511 | SHARED_CONTEXT; |
1512 | { |
1513 | SV* fake_stash = newSVpv(HvNAME_get(stash), 0); |
1514 | (void)sv_bless(ssv, (HV*)fake_stash); |
1515 | } |
1516 | CALLER_CONTEXT; |
1517 | LEAVE_LOCK; |
1518 | } |
1519 | /* XSRETURN(1); - implied */ |
5c360ac5 |
1520 | |
73e09c8f |
1521 | #endif /* USE_ITHREADS */ |
1522 | |
68795e93 |
1523 | BOOT: |
1524 | { |
73e09c8f |
1525 | #ifdef USE_ITHREADS |
68795e93 |
1526 | Perl_sharedsv_init(aTHX); |
73e09c8f |
1527 | #endif /* USE_ITHREADS */ |
68795e93 |
1528 | } |